Liklihood is one of two things.... if they're a variety noted for holding long then you should get a crop albeit late, their root system will be behind and have to catch up, if they're not a long holding variety they'll probably bolt.... before they've headed up the day-length will be such that they want to flower.... useful experiment though and nextr year I might try and formalise it by growing a standard set outdoors and a back-up set in big pots in the unheated bit of the GH...